Correspondence between BrainMap and Resting-FMRI ICA components

Neural connections, providing the
substrate for functional networks,
exist whether or not they are functionally active at any given
moment. However, it is not known to what extent brain regions are
continuously interacting when the brain is "at rest". In this work
we identify the major explicit activation networks by carrying
out the first image-based activation network analysis of thousands of
separate activation maps derived from the BrainMap database of
functional imaging studies, involving nearly thirty thousand human
subjects. Independently, we extract the major covarying
networks in the resting brain, as imaged with functional magnetic
resonance imaging in thirty-six subjects at rest. The sets of major
brain networks, and their decompositions into sub-networks, show close
correspondence between the independent analyses of resting and
activation brain dynamics. We conclude that the full repertoire of
functional networks utilised by the brain in action is continuously
and dynamically "active" even when "at rest".